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A. P. MOOOLLAM.

ALARM LOOK.

No. 301,252. Patented July 1, 1884.

,ithvrrien .fd'rmrns ALEXANDER F. MOOOLLAM, OFFAIR PLAY, CALIFORNIA.

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EZPECIFICATIQN forming part of Letters Patent No. 301,252, dated July 1, 188%.

Application filed March 31, 1884.

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Be it known that I, .ALEXANDER F. MoCon LAM, of Fair Play, county of El Dorado, and State of California, have invented an Improvement in Alarm-Locks; *and I'hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to a new and useful alarm-lock; and it consists, in connection with the reciprocating latclrshank and key of a lock; of a novel arrangement of springstrikers operated by said shank and key, and of a gong inclosed by the lock-casing, againstwhioh said strikers operate, as I shall hereinafter fully explain by reference to the accompanying drawings, in which Figure l is a perspective view of my alarmlock. Fig. 2 is a portion of a.vertical transverse section, showing the key M in the lock. Fig. 3 is an end view of the key. 7

The object of my invention is to provide a lock with an alarm attachment adapted to be sounded when the handle of the latchis turned and when the key is turned in the look.

A is the casing of an ordinary flat lock.

13 is the latch, and (lis the spring influencing it.

D is the shank of the latch, against the angled end of which the wings e of the oscillating shaft E of the handle or knob operate to reciprocate the latch.

F is the dead-latch mechanism.

G is the sliding bolt, and H is the pivoted spring-guard, in the slotted end of which stud, g, on the sliding bolt plays.

I is a spring-wire bent to a U shape, so cured by itsbase to the lock-casing, guided across its arms by a bar or wire, i, which also limits the divergence of the arms, and having on its ends the knobs J. These ends of the arms have a double curvature or bend, turning at right angles away from the nearest wall of the casing, and thence at right angles sidewise. Upon the shank of the latch is a downwardly-extending arm, K, the end of which is notohed'or forked. The exterior edges of the forks are beveled. This arm engages with the ends of the spring-arms in such manner that the inner straight walls of its forks alternately force back the springarms and release them suddenly, while their beveled edges slip by (X0 model.)

them when moving in an opposite direction. Secured in the casing is a spring-wire, L, having a bend, Z, extending down between the wall of the casing and the spring-guard H. Its free end extends upwardly, is bent as shown, and provided with a knob, l.

M is the key, the bit of which is provided with the usual grooves, m, for engaging and raising the spring-guard of the bolt; but the face or edge of the bit at each end is beveled, as shown at m, and these bevels engage with the bend l of the spring-wire L when the key is turned. But one of the bevels thus engages at a time. The other engages when the key is put into the look from the reverse side. This engagement forces back the spring L and sud-.

denly releases it, whereby its knob is thrown against the gong.

N is the gong. It is secured within the casing on a central post, a, and it covers the spring-strikers, which by the movement of the latchand key operate against it to sound an alarm. The advantage of the U shaped striker is that it operates both on the inward and outward movement of the latch, so that when the knob is seized, turned, and released a double alarm is given.

O is a wedge-slide to throw the spring-wire I out of engagement with the arm K. This slide operates behind the arms of the springwire, and by its wedge-shaped surface forces said arms far enough out to avoid the arm K, or lets them spring into engagement again. There being two arms of the spring-wire I, there are two wedges, 0, on the slide, one op erating under each arm. The end of the slide projects through the casing, and has formed on it a knob or linger-hold to adapt'it to be con veniently operated.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In combination with the reciprocating shank of the latch of a lock, having an arm, K, with a forked end, the exterior edges of which are beveled, as described, the U-shaped spring-striker I, having oppositely-bent ends with knobs J thereon, said ends being engaged by the forked end of the arm K, and the gong tially as herein. described.

2. In an alarm-lock, the gong N and the U- shaped spring-striker I, in combination with the arm K on the reciprocating shank of the latch, engaging with and operating said striker, and the wedge-slide 0, moving under the arms of the striker and adapted to throw their ends out of engagement with arm K, substantially as herein described.

3. In an alarn1-1ock, the gong N, incombination with a spring-striker adapted to be actuated to strike said gong by the engagement of the bit of the key, substantially as herein described.

4. .In an alarm-lock, the gong N and the spring-striker L, having bend land knob 7/, 15 in combination with the key M, having a bit with bevels an, adapted to engage with the bend Z of the spring-striker, substantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

ALEXANDER 1 u ootmi. [1,. 3.] WVitnesses:

VILLIAM GARDNER, ISAAC M. WALTER. 

